Definition of macrochoanitic in US English:

macrochoanitic

adjective

  • Having (relatively) long septal necks; (in later use) specifically having septal necks that extend backward to the preceding septum and are invaginated with the preceding neck.

Origin

Late 19th century. From macrochoanite + -ic.

Pronunciation

macrochoanitic

/ˌmakrəʊkəʊəˈnɪtɪk/